TXO I use same thing to clean ours plus some Tilex, ours factory cover plus add a blue tarp thats 24 x 40 from harbour freight, and I leave the top proped up so I have plenty of fall for water shed and leave back gate and front gate cracked for ventilation but still get moldy. My neighbor has a big metal shed over his and lightly drapes cover ove it and it still molds. I guess a never ending battle. unless ya keep inside acclimated all winter.
This Is a very true statement
Older you get , the Less friends you have, think about it.